甲烷化学链干重整制合成气的氧载体La_(1-x)Sr_(x)Fe_(0.8)Al_(0.2)O_(3)性能研究  

The Performance Study on La_(1-x)Sr_(x)Fe_(0.8)Al_(0.2)O_(3)Oxygen Carriers in Chemical Looping Dry Reforming of Methane for Syngas Production

作　　者：杨天龙 张晋睿 饶琼 盖忠睿 李扬 潘莹[2] 金红光[2] YANG Tianlong;ZHANG Jinrui;RAO Qiong;GAI Zhongrui;LI Yang;PAN Ying;JIN Hongguang(International Research Center for Renewable Energy&State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China;Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]西安交通大学可再生能源国际研究中心暨动力工程多相流国家重点实验室,西安710049 [2]中国科学院工程热物理研究所,北京100190 [3]中国科学院大学,北京100049

出　　处：《工程热物理学报》2024年第9期2551-2557,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.52176026,No.52241601,No.51888103)。

摘　　要：通过化学链方法使用氧载体中的晶格氧进行甲烷的部分氧化反应制合成气,可以实现高的产物选择性。本文采用溶胶凝胶法制备了氧载体La_(1-x)Sr_(x)Fe_(0.8)Al_(0.2)O_(3)用于甲烷化学链干重整反应,使用热重和固定床反应器对不同比例Sr掺杂氧载体的反应性能进行测试。实验结果表明La_(1-x)Sr_(x)Fe_(0.8)Al_(0.2)O_(3)中x=0.4的氧载体氧容量高达1.88 mmol·g^(-1),反应性能优异,同时积碳量较少。进一步对氧载体La_(0.6)Sr_(0.4)Fe_(0.8)Al_(0.2)O_(3)进行了20次循环稳定性测试,发现氧载体保持优异的氧化还原性能,实现了61.2%的甲烷转化率,97.1%的CO选择性,1.81的H_(2)/CO。氧载体的表征结果显示,反应前后氧载体的微观形貌以及晶相结构均未发生改变。本文的结果表明La_(0.6)Sr_(0.4)Fe_(0.8)Al_(0.2)O_(3)是适用于甲烷化学链干重整反应的高性能氧载体。Chemical looping can achieve high product selectivity using lattice oxygen in oxygen carriers for partial oxidation of methane.Oxygen carrier La_(1-x)Sr_(x)Fe_(0.8)Al_(0.2)O_(3) was prepared by sol-gel method for chemical looping dry reforming of methane.The reaction performance of the oxygen carrier doped with different proportions of Sr was tested by thermogravimetric and fixed bed reactor.The experimental results showed that the oxygen capacity of x=0.4 oxygen carrier in La_(1-x)Sr_(x)Fe_(0.8)Al_(0.2)O_(3)is as high as 1.88 mmol·g^(−1),with excellent reaction performance and less carbon deposition.The stability of the oxygen carrier La_(0.6)Sr_(0.4)Fe_(0.8)Al_(0.2)O_(3) was further tested for 20 redox cycles.The oxygen carrier maintained excellent redox performance,achieving 61.2%methane conversion,97.1%CO selectivity,and 1.81 H_(2)/CO.The material characterization results displayed that the morphology and crystal structure of the oxygen carrier were stable.The results show that La_(0.6)Sr_(0.4)Fe_(0.8)Al_(0.2)O_(3) is an excellent oxygen carrier suitable for chemical looping dry reforming of methane.

关 键 词：化学链 甲烷干重整 钙钛矿 合成气 

分 类 号：TK123[动力工程及工程热物理—工程热物理]